Readily-soluble vat color preparations



Patented Apr; 30, 1929.

UNITED STATES PATENT OFFICE.

WILHELK BAUER AND ALFRED HERRE', OF OPLADEN, NEAR COLOGNE, AND mm I'UNKE, OF HOCHST-ON-THE-MAIN, GERIANY, ASSIGNORS TO GRASSELLI DYE- STUFF CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

READILY-SOLUBLE VAT COLOR PREPARATIONS.

K Drawing. Application filed November 29, 1924, Serial No. 752,936, and in Germany December 10, 1988.

We have invented certain new and useful improvements in readily soluble vat color preparations.

This invention relates to the production of vat color preparations which dissolve readily in water with simultaneous formation of the leuco compounds. The solid, dry vat colorpreparations also form part of the present invention.

The constant increase of the use of the vat colors for dyeing exceedingly fast shades on vegetable or animal fibres is somewhat hampered by complications in the method of applying these colors to the fibre. The dye- 16 stufis have to be brought into a soluble form by treating same in aqueous suspension with a reducing agent at sometimes high temperature, whereas the preparations which form the subject of this invention are readily solu- 20 ble in cold or, at the most, in luke warm water and can be used as easily as direct cotton colors.

We have found if water insoluble vat colors are treated with a dispersing agent. the

dyestufis are transformed into a comminuted form, which allows them to react instantaneously with the reducing agent in presence of cold water to form the easilysolubl leuco com ounds. Amongst the compounds which so disp ay such a dispersing action, we have found to be very active certain salts of sulfonic acids, i. e., the sulfonic acid salts of unsaturated fatty acids, salts of lignine sulfonic acids, waste sulfite cellulose liquor. further more, easily soluble carbohydrates which might also have a reducing efiect such as glucose, dextrine, etc. can be used. One form of practicing our invention is to mix the insoluble d estufi with caustic alkali solution and 40 an alhali metal salt of adispersing sulfonic acid and evaporate the reaction product to dryness. The resulting powder is then inti-' mately mixed with a hvdrosulfite preparation. The solid preparations obtained in this -15 way are perfectly stable and most readily dissolve when moistened with water.

Alternatively the new preparations may be obtained as follows: The insoluble dyestufis are treated in suspension with the dispersing so salt with an eventual addition of free alkali; the finely comminuted color is filtered ofl, dried and intimately mixed with a reducing agent and eventually the necessary adj uvants as, for instance free alkali, when using alkali metal hydrosulfite as a reducing agent.

This process possesses the advantage over that first described that solid or pasty vat color preparations are obtained which are of higher strength in consequence ofthe absence of the sulfonic acid salts. moval of the dispersing agent is also of advantage in so far as the dispersing a ent may be chosen without consideration 0 any undesirable effect it may exercise in the vat, in which it is, of course, no'longer present.

The following specific examples will further illustrate the invention, but it is understood that the invention is not limited to the vat colors mentioned, nor to the specific disper-sing or reducing agents used. The parts are by weight.

Ewample 15-10 parts of 2-(4'-chloranilido) ll-naphthoquinone are intimately mixed with 5 parts of monopole soap (sulfonated castor oil) dissolved in a little water and 14 parts of caustic soda solution of 40 B. and evaporated to dryness in the absence of air. with the addition of 8 vparts of hydrosulfite powder. The preparation thus obtained, on

The re- The product obtained is then ground being covered with water, dissolves immediately and can be used for dyeing without further additions.

Ewample 2.1O arts dianilido-quinone are added to a solutlon of 4 parts monopole soap in water and are stirred with 20 parts of caustic soda solution of 40 B. The mass is then dried in vacuum. The dried product is then well mixed with 7 parts of hydrosulfite powder. The preparation thus obtained dissolves easily when covered with water.

Emample 3.20 parts of di-(p-chloranilido) -benzoquinone in the form of a 50% paste are stirred up in 50 parts of water and mixed with 2 parts of monopole soap and 3 parts of soda solution of 40 B. This mix- .ture is heated for sometime at 60 C. and the dyestutf is then filtered off. The loose powder obtained is finally mixed intimately with 7 parts of caustic soda and 7 parts hydrosulfite powder and the mixture is made up'into a paste. i

We claim:

' 1. The process of producing dry readily soluble vat color preparations which comprises treating .di-(p-chloro-anilido) benzoquinone with a dispersing agent and an alkali in the presence of water, drying the mixture and mixing therewith a reducin agent which is capable of reducing the insoluble vat color .to its leuco form.

2. The process of producing readily soluble vat color preparations which comprises treatin di-(p-ehloro-anilido) benzoquinone with a dispersing agent and an alkali in the presence of water, separating the solids from the mixture and mixing therewith a reducing agent capable of reducing the insoluble vat color to its leuco form.

3. The process of producin readily soluble vat color preparations w ich comprises treating di-(p-chloro-anilido) benzoquinone with a dispersing salt of a sulfonated unsaturated fatty acid in the presence of water, se arating the solids from the mixture and mixing therewith an alkali and a hydrosul 4. As a new roduet, the readily soluble vat color preparation consistin of a mixture of a reducing agent capable o reducing insolu: ble vat colors to their leuco form, an alkali and di-(p-chloro-anilido) benzoquinone dispersed by the action of a dispersing agent.

prises treating an insoluble vat dycstutf with an alkali and a dispersing salt of a sult'onic acid in the presence of water, drying the mixture and mixing therewith a reducing agent which is capable of reducing the insoluble vat dyestufi' to its leuco form. a 8. The process of preparing dry readily soluble vat dyestuff preparations which coinprises treating an insoluble vat dyestufl with an alkali and a dispersing salt of a sulfonatcd unsaturated fatty acidin the presence of water, drying themixture and mixing therewith a reducing agent which is capable of reducing the insoluble vat dyestuii' to its leuco form.

9. The process of preparing dry readily soluble vat dyestutl' preparations which comprises treating an insolublevat dyestuft with an alkali metal salt of a sulfona-ted unsaturated fatty acid in the presence of water, drying the mixture and mixing therewith an alkali and a hydrosulfite. V V

10. The process of preparing readily soluble vat dyestufi preparations which comprises treating an insoluble vat dyestufl. with a dispersing agent in the presence of water, separating the solids from the mixture, and mix ing therewith a reducing agent which is capable of reducing the insoluble vat dyestufi to its leuco form.

with a reducing agent which is capable of geducing the insoluble vat dyestufi to its leuco orm.

'12. The process of preparin readily soluble vat dyestufi reparations which comprises treatin an inso uble vat dyestufi' with an alkali an a dispersing salt of a sulfonated unsaturated fatty acid in the presence of water, separating the solids from the mixture, and mixin therewith a reducing agent which is capab e of reducing the insoluble vat dyestufi to its leuco form. t

1.3. The process of preparin readily soluble vat dy'estufi pre 'arations w ich comprises treating an insolub e vat dyestufiwi'th a dispersing salt of a sulfonated un'saturated'fatt acid in the presence of water, separating the solids from the mixture and mixing therewith an alkali and a hydrosulfite'. r 14. As a new product a readily soluble vat dyestufl preparation-comprisin a dispersed which is capable of reducing the insoluble vat dystufl' to its leuco form.

15. As a new product a readily soluble vat dyestufi' preparation comprising a dispersed insoluble vat dyestuif, an alkali and a reduc insoluble vat dyestufi and a re ucing agent ing agent which is capable of reducing the insoluble vat dyestufi to its leuco form.

16. As a new product a readily soluble vat dyestufl preparation comprising a dispersed insoluble vat dyestufi 'a ispersing sulfonic acid salt, an alkali and-a reducing agent which is capable of reducing the insoluble vat dyestutf to its leuco form.

17 As a new product a readily soluble vat dyestufi preparation comprising a dispersed insoluble vat dyestufi, a salt of a sulfonated unsaturated fatty acid, an alkali and a reducing agent which is ca able of reducing the insoluble vat dyestufl to its leuco form.

18. As a new product a readily soluble vat dyestufi preparation comprising a dispersed insoluble vat dyestufi. a salt. of a sulfonated unsaturated fatty acid, an alkali and a hydrosulfite.

19. As a new product a' readily soluble vat dyestulf preparation comprising a mixture of an insoluble vat dyestufl dispersed by the action of a dispersing sulfonic acid alkali metal salt and an alkali, and a reducin agent which is capable of reducing the insolu 1e vat dyestufi preparation comprising a mixture of vat dyestufi dispersed by the action of a salt a hydrosulfite, an alkali and an insoluble vat of a sulfonated unsaturated fatty acid. 1 dyestufi dispersed b the action of a dispers- In testimony whereof we have hereunto set 1 ing sulfonic acid a kali metal salt and an our hands.

5 alkali. 7

e 21. As a new product .a readily soluble vat r WILHELM BAUER.- dyestufl preparation comprising a mixture ALFRED HERRE.

of a hydrosulfite, an alkali and an insoluble ALBERT FUNKE, 

